The Defender
Old Waldorf Bar Days (1931)
The name of an American yacht which took care of one of Sir Thomas Lipton's early but seemingly endless “Shamrocks*”

Dash Orange Bitters
One-half [1 ½ parts] Tom Gin
One-half [1 ½ parts] Italian Vermouth
Two dashes [¼ part] Crème Yvette
Stir

*Shamrock is the name of Sir Thomas Lipton's fleet of America's Cup racing yachts.